Makefile.extrawarn

   1 # From linux.git/scripts/Kbuild.include
   2 #
   3 # try-run
   4 # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
   5 # Exit code chooses option. "$$TMP" is can be used as temporary file and
   6 # is automatically cleaned up.
   7 try-run = $(shell set -e;               \
   8         TMP="$(TMPOUT).$$$$.tmp";       \
   9         TMPO="$(TMPOUT).$$$$.o";        \
  10         if ($(1)) >/dev/null 2>&1;      \
  11         then echo "$(2)";               \
  12         else echo "$(3)";               \
  13         fi;                             \
  14         rm -f "$$TMP" "$$TMPO")
  15
  16  # cc-option
  17  # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
  18
  19  cc-option = $(call try-run,\
  20          $(CC) $(CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
  21
  22 # From linux.git/scripts/Makefile.extrawarn
  23 # ==========================================================================
  24 #
  25 # make W=... settings
  26 #
  27 # W=1 - warnings that may be relevant and does not occur too often
  28 # W=2 - warnings that occur quite often but may still be relevant
  29 # W=3 - the more obscure warnings, can most likely be ignored
  30 #
  31 # $(call cc-option, -W...) handles gcc -W.. options which
  32 # are not supported by all versions of the compiler
  33 # ==========================================================================
  34
  35 ifeq ("$(origin W)", "command line")
  36   export BUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
  37 endif
  38
  39 ifdef BUILD_ENABLE_EXTRA_GCC_CHECKS
  40 warning-  := $(empty)
  41
  42 warning-1 := -Wextra -Wunused -Wno-unused-parameter
  43 warning-1 += -Wmissing-declarations
  44 warning-1 += -Wmissing-format-attribute
  45 warning-1 += $(call cc-option, -Wmissing-prototypes)
  46 warning-1 += -Wold-style-definition
  47 warning-1 += $(call cc-option, -Wmissing-include-dirs)
  48 warning-1 += $(call cc-option, -Wunused-but-set-variable)
  49 warning-1 += $(call cc-disable-warning, missing-field-initializers)
  50
  51 warning-2 := -Waggregate-return
  52 warning-2 += -Wcast-align
  53 warning-2 += -Wdisabled-optimization
  54 warning-2 += -Wnested-externs
  55 warning-2 += -Wshadow
  56 warning-2 += $(call cc-option, -Wlogical-op)
  57 warning-2 += $(call cc-option, -Wmissing-field-initializers)
  58
  59 warning-3 := -Wbad-function-cast
  60 warning-3 += -Wcast-qual
  61 warning-3 += -Wconversion
  62 warning-3 += -Wpacked
  63 warning-3 += -Wpadded
  64 warning-3 += -Wpointer-arith
  65 warning-3 += -Wredundant-decls
  66 warning-3 += -Wswitch-default
  67 warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
  68 warning-3 += $(call cc-option, -Wvla)
  69
  70 warning := $(warning-$(findstring 1, $(BUILD_ENABLE_EXTRA_GCC_CHECKS)))
  71 warning += $(warning-$(findstring 2, $(BUILD_ENABLE_EXTRA_GCC_CHECKS)))
  72 warning += $(warning-$(findstring 3, $(BUILD_ENABLE_EXTRA_GCC_CHECKS)))
  73
  74 ifeq ("$(strip $(warning))","")
  75         $(error W=$(BUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
  76 endif
  77
  78 EXTRAWARN_CFLAGS += $(warning)
  79 else
  80
  81 ifeq ($(COMPILER),clang)
  82 EXTRAWARN_CFLAGS += $(call cc-disable-warning, initializer-overrides)
  83 EXTRAWARN_CFLAGS += $(call cc-disable-warning, unused-value)
  84 EXTRAWARN_CFLAGS += $(call cc-disable-warning, format)
  85 EXTRAWARN_CFLAGS += $(call cc-disable-warning, unknown-warning-option)
  86 EXTRAWARN_CFLAGS += $(call cc-disable-warning, sign-compare)
  87 EXTRAWARN_CFLAGS += $(call cc-disable-warning, format-zero-length)
  88 EXTRAWARN_CFLAGS += $(call cc-disable-warning, uninitialized)
  89 endif
  90 endif